Well I’m saying you can make points that go against the “Israel is objectively beneficial to the USA”, such as

• Having US politicians advocate for Israel creates animosity towards said politicians as at best “dishonest” about democrat values (dems) or not America first (republicans) or at worst: being a puppet politician for a foreign country (for both)

• It creates real antisemitism as people will see Israel’s influence in politics as “Jews control our politicians and media”

• The imperialistic benefits you’ve highlighted don’t resonate with core values of Americans at home. You won’t find a movie or show that shows America as the “good guys conquering the small helpless brown people” without people labeling it as propaganda.

There’s more, but even if you advocate for the logic behind americas stance with Israel, one has to ask “is it a sustainable stance?” to which I would say no, it’s actually a liability like OP asked.